v3.24.0.1
Post-Employment Benefits - Defined Benefit Pension Plan Assets (Details) - Defined benefit plans - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets $ 9,839 $ 8,472 $ 10,655
Fair value measured at Levels 1, 2 and 3      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 3,795 3,360  
Fair value measured at Levels 1, 2 and 3 | U.S. large cap      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets [1] 1,018 949  
Fair value measured at Levels 1, 2 and 3 | U.S. mid cap      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets [2] 173 157  
Fair value measured at Levels 1, 2 and 3 | International      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets [3] 488 327  
Fair value measured at Levels 1, 2 and 3 | U.S. government securities      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets [4] 246 237  
Fair value measured at Levels 1, 2 and 3 | Corporate debt instruments      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets [4] 714 680  
Fair value measured at Levels 1, 2 and 3 | Non-U.S. government securities      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets [4] 461 548  
Fair value measured at Levels 1, 2 and 3 | Other fixed income securities      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets [4] 126 84  
Fair value measured at Levels 1, 2 and 3 | Absolute return funds      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets [5] 155 91  
Fair value measured at Levels 1, 2 and 3 | Real assets      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets   9  
Fair value measured at Levels 1, 2 and 3 | Other plan assets      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets [6] 414 278  
Quoted prices in active markets for identical assets (Level 1)      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 2,800 2,419  
Quoted prices in active markets for identical assets (Level 1) | U.S. large cap      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets [1] 1,018 949  
Quoted prices in active markets for identical assets (Level 1) | U.S. mid cap      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets [2] 173 157  
Quoted prices in active markets for identical assets (Level 1) | International      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets [3] 488 327  
Quoted prices in active markets for identical assets (Level 1) | U.S. government securities      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets [4] 62 69  
Quoted prices in active markets for identical assets (Level 1) | Corporate debt instruments      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets [4] 155 144  
Quoted prices in active markets for identical assets (Level 1) | Non-U.S. government securities      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets [4] 301 402  
Quoted prices in active markets for identical assets (Level 1) | Other fixed income securities      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets [4] 124 81  
Quoted prices in active markets for identical assets (Level 1) | Absolute return funds      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets [5] 66 4  
Quoted prices in active markets for identical assets (Level 1) | Real assets      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets   9  
Quoted prices in active markets for identical assets (Level 1) | Other plan assets      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets [6] 413 277  
Significant other observable inputs (Level 2)      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 995 941  
Significant other observable inputs (Level 2) | U.S. large cap      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets [1] 0 0  
Significant other observable inputs (Level 2) | U.S. mid cap      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets [2] 0 0  
Significant other observable inputs (Level 2) | International      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets [3] 0 0  
Significant other observable inputs (Level 2) | U.S. government securities      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets [4] 184 168  
Significant other observable inputs (Level 2) | Corporate debt instruments      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets [4] 559 536  
Significant other observable inputs (Level 2) | Non-U.S. government securities      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets [4] 160 146  
Significant other observable inputs (Level 2) | Other fixed income securities      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets [4] 2 3  
Significant other observable inputs (Level 2) | Absolute return funds      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets [5] 89 87  
Significant other observable inputs (Level 2) | Real assets      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets   0  
Significant other observable inputs (Level 2) | Other plan assets      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets [6] 1 1  
Significant unobservable inputs (Level 3)      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 0 0  
Significant unobservable inputs (Level 3) | U.S. large cap      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets [1] 0 0  
Significant unobservable inputs (Level 3) | U.S. mid cap      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets [2] 0 0  
Significant unobservable inputs (Level 3) | International      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets [3] 0 0  
Significant unobservable inputs (Level 3) | U.S. government securities      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets [4] 0 0  
Significant unobservable inputs (Level 3) | Corporate debt instruments      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets [4] 0 0  
Significant unobservable inputs (Level 3) | Non-U.S. government securities      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets [4] 0 0  
Significant unobservable inputs (Level 3) | Other fixed income securities      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets [4] 0 0  
Significant unobservable inputs (Level 3) | Absolute return funds      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets [5] 0 0  
Significant unobservable inputs (Level 3) | Real assets      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets   0  
Significant unobservable inputs (Level 3) | Other plan assets      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets [6] 0 0  
Total assets measured at NAV      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets $ 6,044 $ 5,112  
[1] A mix of index funds and actively managed equity accounts that are benchmarked to various large cap indices.
[2] A mix of index funds and actively managed equity accounts that are benchmarked to various mid cap indices.
[3] A mix of index funds and actively managed equity accounts that are benchmarked to various non-U.S. equity indices in both developed and emerging markets.
[4] Securities held by actively managed accounts, index funds and mutual funds.
[5] Primarily funds having global mandates with the flexibility to allocate capital broadly across a wide range of asset classes and strategies, including but not limited to equities, fixed income, commodities, financial futures, currencies and other securities, with objectives to outperform agreed upon benchmarks of specific return and volatility targets.
[6] Investments in cash and cash equivalents.